CVE-2019-17210

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A denial-of-service issue was discovered in the MQTT library in Arm Mbed OS 2017-11-02. The function readMQTTLenString() is called by the function MQTTDeserialize_publish() to get the length and content of the MQTT topic name. In the function readMQTTLenString(), mqttstring->lenstring.len is a part of user input, which can be manipulated. An attacker can simply change it to a larger value to invalidate the if statement so that the statements inside the if statement are skipped, letting the value of mqttstring->lenstring.data default to zero. Later, curn is accessed, which points to mqttstring->lenstring.data. On an Arm Cortex-M chip, the value at address 0x0 is actually the initialization value for the MSP register. It is highly dependent on the actual firmware. Therefore, the behavior of the program is unpredictable from this time on.

Se detectó un problema de denegación de servicio en la biblioteca MQTT en Arm Mbed OS en 02-11-2017. La función MQTTDeserialize_publish() es llamada por la función readMQTTLenString() para conseguir la longitud y el contenido del nombre del tema MQTT. En la función readMQTTLenString(), mqttstring-)lenstring.len es una parte de la entrada del usuario, que puede ser manipulada. Un atacante puede simplemente cambiarlo a un valor mas grande para invalidar la sentencia if de manera que las sentencias dentro de la sentencia if sean omitidas, dejando el valor de mqttstring-)lenstring.data predeterminado en cero. Más tarde, curn es accedida, la cual apunta a mqttstring-)lenstring.data. En un chip DE Arm Cortex-M, el valor en la dirección 0x0 es realmente el valor de inicialización para el registro MSP. Este es muy dependiente del firmware actual. Por lo tanto, el comportamiento del programa es impredecible desde este momento.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-10-06 CVE Reserved
2019-11-04 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (1)

URL	Tag	Source
https://github.com/ARMmbed/mbed-os/issues/11802	Issue Tracking

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Arm Search vendor "Arm"	Mbed-mqtt Search vendor "Arm" for product "Mbed-mqtt"	2017-11-02 Search vendor "Arm" for product "Mbed-mqtt" and version "2017-11-02"	-	Affected	in	Arm Search vendor "Arm"	Mbed-os Search vendor "Arm" for product "Mbed-os"	-	-	Affected